The unconfirmed report comes from DanielRPK on Twitter. "Not a huge surprise but from what I hear, Gambit and Dr. Doom are officially dead," he wrote. "As for X-Force, it's not 'officially' dead, but they only have two months to start filming and that's not gonna happen. So... not happening, not with Fox anyway."
New Mutants will be the last X-Men Universe movie for Fox and Dark Phoenix the last one coming from the main series.— Daniel Richtman (@DanielRPK) January 11, 2019
Also known as Daniel Richtman, he then claimed in a follow-up tweet that "New Mutants will be the last X-Men Universe movie for Fox and Dark Phoenix the last one coming from the main series," later adding that films focused on Silver Surfer, Kitty Pryde and Multiple Man were also dead.
Silver Surfer, Kitty Pryde and Multiple Man are also dead...— Daniel Richtman (@DanielRPK) January 11, 2019
Given the impending Disney/Fox merger, it is easy to believe that Richtman's information might prove correct. However, X-Force, Gambit and Doctor Doom have had a fair amount of time and effort already put into them.
Actor Channing Tatum has been signed on for the Gambit film for years now. And just this past September, producer Simon Kinberg claimed that the film was going ahead and even spoke to the film's tone. Additionally, reports have suggested that the film was targeting an early 2019 production start date.
It was in that same interview that Kinberg also explained that Drew Goddard was preparing to get to work on the X-Force script following the release of Bad Times at the El Royale. Moreover, Fox laid the groundwork for the film with Deadpool 2.
It was also reported this past June that Noah Hawley had completed the script for the solo Doctor Doom film.
Right now, it's best to take this report with a grain of salt and wait for an official statement from Fox and/or Disney to get the specific details regarding the cinematic future of Marvel's mutants.
Written and directed by X-franchise veteran Simon Kinberg, Dark Phoenix stars James McAvoy, Michael Fassbender, Jennifer Lawrence, Nicholas Hoult, Sophie Turner, Tye Sheridan, Alexandra Shipp, Kodi Smit-McPhee, Evan Peters and Jessica Chastain. The film is scheduled to be released on June 7.